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Stellar Brief: 19. 10. 2026
One of the coldest worlds near the Sun is showing surprisingly lively weather: JWST observations reveal patchy water clouds and changing atmospheric gases on the brown dwarf WISE 0855, which is only about 265 kelvin—colder than a winter’s day on Earth.
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6. 5. 2026
Sterne | Exoplaneten | Planetenatmosphären | Heißer JupiterMASCARA-5 b (also known as TOI-1431 b) is an ultra-hot Jupiter orbiting a bright Am star. Using the EXPRES spectrograph, scientists confirmed the presence of neutral iron (Fe I) in the planet's dayside atmosphere with high significance. The detection supports previous findings and indicates that the planet's atmosphere is thermally inverted, with temperatures rising from about 2000 K at lower altitudes to around 4500 K higher up.
No evidence was found for ionized iron (Fe II) or neutral chrom...
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6. 5. 2026Sterne | ExoplaneteDelorme 1 (AB)b is a young, massive planet—about 13 times the mass of Jupiter—orbiting a binary star at a wide distance. Using high-resolution optical spectroscopy, scientists detected seven helium emission lines from the planet, which show significant variability and asymmetric profiles. The lines have both narrow and broad components, with the broad part redshifted by about 15 km/s, indicating complex gas motions.
The analysis suggests that ...
Read article 6. 5. 2026Sterne | ExoplaneteThe β Pictoris young moving group contains a variety of substellar objects, including gas giants and brown dwarfs. Scientists studied the atmospheric chemistry and isotope ratios of three members: the planetary-mass companion 2MASS J0249-0557 c and two benchmark brown dwarfs. Using high-resolution spectroscopy, they measured the carbon-to-oxygen ratio, metallicity, and the ratio of carbon isotopes in their atmospheres.
2MASS J0249-0557 c, with...
Read article 6. 5. 2026Sterne | ExoplaneteGJ 436 b is a warm Neptune-sized planet orbiting a red dwarf star. Scientists used the ESPRESSO spectrograph to observe two transits of the planet, aiming to detect atomic and molecular species in its upper atmosphere. The observations covered a wide range of optical wavelengths and searched for signals from hydrogen, sodium, magnesium, iron, and other elements, as well as molecules like titanium oxide and vanadium oxide.
The analysis found no...
Read article 6. 5. 2026Sterne | ExoplaneteWASP-121 b is an ultra-hot Jupiter with extreme atmospheric conditions, including high temperatures, strong winds, and dramatic differences between its day and night sides. Using the James Webb Space Telescope, scientists measured how the planet's infrared emission changes as it orbits its star, creating a spectroscopic phase curve. Comparing these observations to advanced 3-D atmospheric models, they found that the models predict about 12% more ...
Read article 6. 5. 2026Sterne | ExoplaneteTOI-1130b is a mini-Neptune planet in a rare system with an outer hot Jupiter, both orbiting in a 2:1 resonance. Using the James Webb Space Telescope, scientists measured the planet's transmission spectrum and detected water vapor, carbon dioxide, and sulfur dioxide in its atmosphere, with a possible hint of methane. The atmosphere has a high mean molecular weight and is rich in heavy elements, suggesting it contains many volatiles.
The result...
Read article 6. 5. 2026Understanding the interior structure of rocky and water-rich exoplanets requires accurate equations of state (EoS) that describe how materials behave under different pressures and temperatures. The new PALEOS toolkit brings together EoS for iron, magnesium silicate, and water into a unified, phase-aware framework that covers 17 different material phases. This allows scientists to model density, energy, entropy, heat capacity, and other properties...
Read article 6. 5. 2026Sterne | ExoplaneteGJ 1132 b is an Earth-sized planet orbiting a small red dwarf star every 1.6 days. Scientists studied how much high-energy XUV radiation the planet has received over its lifetime, which is important for understanding whether it can keep an atmosphere. By analyzing the star's activity and flare history, they found that GJ 1132 b has likely received at least 50 times more XUV radiation than Earth does today.
The study compared different models f...
Read article 22. 4. 2026Sterne | Exoplaneten | TESSTOI-1710 b is a super-Neptune planet orbiting a cool star, but unlike most planets, its orbit is strongly misaligned and retrograde, meaning it moves in the opposite direction to the star's rotation. This was determined using high-precision radial velocity measurements during a transit, which revealed a large angle between the planet's orbital plane and the star's spin axis.
The planet's orbit is wide enough that tidal forces have not altered ...
Read article 21. 4. 2026Sterne | Exoplaneten | TESS | Bewohnbare Exoplaneten | Lava-PlaneteTwo exoplanets were confirmed orbiting a nearby red dwarf star TOI-1752, making it a valuable system for studying planetary diversity. The inner planet, TOI-1752 b, orbits very close to the star and is likely a lava world, with surface temperatures high enough to melt rock. The outer planet, TOI-1752 c, is a sub-Neptune-size planet that orbits within the optimistic habitable zone, where conditions could allow for liquid water.
Researchers comb...
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Neu entdeckte Exoplaneten
| EK Chamaeleontis b | 10 / 2026 | 2702.2 M⊕ | 321.3 ly | |
| HD 715 b | 10 / 2026 | 201.9 M⊕ | 542.8 ly | |
| DENIS J1253-5709 b | 10 / 2026 | 244.8 M⊕ | 54.4 ly | |
| TOI-6417 b | 09 / 2026 | 349.7 M⊕ | 1903.9 ly | |
| TOI-6443 b | 09 / 2026 | 1605.4 M⊕ | 2051.6 ly | |
| TOI-7219 b | 09 / 2026 | 661 M⊕ | 1074.2 ly | |
| TOI-4079 B b | 09 / 2026 | 1646.8 M⊕ | 1185.6 ly | |
| HD 45652 b | 09 / 2026 | 1557.7 M⊕ | 113.9 ly | |
| LSPM J0804+1116 b | 09 / 2026 | 6.4 M⊕ | 82.6 ly | |
| HR 8799 f | 09 / 2026 | 524.5 M⊕ | 133.3 ly | |
| 61 Cygni A b | 09 / 2026 | 2543.3 M⊕ | 11.4 ly | |
| TOI-5646 b | 08 / 2026 | 45.9 M⊕ | 1352.3 ly | |
| TOI-4468 c | 08 / 2026 | 11.1 M⊕ | 1233.1 ly | |
| TOI-4468 b | 08 / 2026 | 170.1 M⊕ | 1233.1 ly | |
| TOI-4468 d | 08 / 2026 | 311 M⊕ | 1233.1 ly |
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